On Tuesday 16 of April 2013, Neil Horman wrote: > A few years back intel published a spec update: > http://www.intel.com/content/dam/doc/specification-update/5520-and-5500-chi > pset-ioh-specification-update.pdf > > For the 5520 and 5500 chipsets which contained an errata (specificially > errata 53), which noted that these chipsets can't properly do interrupt > remapping, and as a result the recommend that interrupt remapping be > disabled in bios. While many vendors have a bios update to do exactly > that, not all do, and of course not all users update their bios to a level > that corrects the problem. As a result, occasionally interrupts can > arrive at a cpu even after affinity for that interrupt has be moved, > leading to lost or spurrious interrupts (usually characterized by the > message: > kernel: do_IRQ: 7.71 No irq handler for vector (irq -1) > > There have been several incidents recently of people seeing this error, and > investigation has shown that they have system for which their BIOS level is > such that this feature was not properly turned off. As such, it would be > good to give them a reminder that their systems are vulnurable to this > problem. For details of those that reported the problem, please see: > https://bugzilla.redhat.com/show_bug.cgi?id=887006 Tested-by: Arkadiusz Miśkiewicz <arekm@xxxxxxxx> (on top of 3.7.10 kernel) Stack trace looks useless for me in this case but according changelog this was already discussed. [ 0.137512] Freeing SMP alternatives: 20k freed [ 0.143539] ACPI: Core revision 20120913 [ 0.156067] dmar: Host address width 40 [ 0.160440] dmar: DRHD base: 0x000000fe710000 flags: 0x1 [ 0.166467] dmar: IOMMU 0: reg_base_addr fe710000 ver 1:0 cap c90780106f0462 ecap f020f7 [ 0.175618] dmar: RMRR base: 0x0000008f62f000 end: 0x0000008f631fff [ 0.182705] dmar: RMRR base: 0x0000008f61a000 end: 0x0000008f61afff [ 0.189792] dmar: RMRR base: 0x0000008f617000 end: 0x0000008f617fff [ 0.196871] dmar: RMRR base: 0x0000008f614000 end: 0x0000008f614fff [ 0.203960] dmar: RMRR base: 0x0000008f611000 end: 0x0000008f611fff [ 0.211047] dmar: RMRR base: 0x0000008f60e000 end: 0x0000008f60efff [ 0.218135] dmar: RMRR base: 0x0000008f60b000 end: 0x0000008f60bfff [ 0.225222] dmar: RMRR base: 0x0000008f608000 end: 0x0000008f608fff [ 0.232309] dmar: RMRR base: 0x0000008f605000 end: 0x0000008f605fff [ 0.239388] dmar: ATSR flags: 0x0 [ 0.243273] ------------[ cut here ]------------ [ 0.248515] WARNING: at /home/users/arekm/rpm/BUILD/kernel-3.7.10/linux-3.7/drivers/iommu/intel_irq_remapping.c:518 intel_irq_remapping_supported+0x37/0x7 a() [ 0.264358] Hardware name: S5500WB [ 0.268238] This system BIOS has enabled interrupt remapping on a chipset that contains an erratum making that feature unstable. To maintain system stability interrupt remapping is being disabled. Please contact your BIOS vendor for an update [ 0.298811] Modules linked in: [ 0.302373] Pid: 1, comm: swapper/0 xid: #0 Not tainted 3.7.10-6 #1 [ 0.309453] Call Trace: [ 0.312270] [<ffffffff8105182a>] warn_slowpath_common+0x7a/0xb0 [ 0.319061] [<ffffffff810518ba>] warn_slowpath_fmt_taint+0x3a/0x40 [ 0.326143] [<ffffffff818e8371>] intel_irq_remapping_supported+0x37/0x7a [ 0.333810] [<ffffffff813b7226>] irq_remapping_supported+0x26/0x30 [ 0.340893] [<ffffffff818bd1be>] enable_IR+0x9/0x3e [ 0.346521] [<ffffffff818bd558>] enable_IR_x2apic+0xa0/0x1e3 [ 0.353024] [<ffffffff814cfdc4>] ? set_cpu_sibling_map+0x415/0x435 [ 0.360108] [<ffffffff818bf47a>] default_setup_apic_routing+0x12/0x6b [ 0.367483] [<ffffffff818bb30b>] native_smp_prepare_cpus+0x2e7/0x336 [ 0.374761] [<ffffffff818abcd5>] kernel_init_freeable+0x89/0x1c4 [ 0.381652] [<ffffffff814b9380>] ? rest_init+0x70/0x70 [ 0.387570] [<ffffffff814b9389>] kernel_init+0x9/0x100 [ 0.393489] [<ffffffff814e8d7c>] ret_from_fork+0x7c/0xb0 [ 0.399602] [<ffffffff814b9380>] ? rest_init+0x70/0x70 [ 0.405524] ---[ end trace bf40f410b44b3726 ]--- [ 0.410830] Switched APIC routing to physical flat. [ 0.416872] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 [ 0.456602] smpboot: CPU0: Intel(R) Xeon(R) CPU X5560 @ 2.80GHz (fam: 06, model: 1a, stepping: 04) [ 0.573650] Performance Events: PEBS fmt1+, 16-deep LBR, Nehalem events, Intel PMU driver. [ 0.583265] perf_event_intel: CPU erratum AAJ80 worked around -- Arkadiusz Miśkiewicz, arekm / maven.pl -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
